*/
static char const *gif_error_msg(int code);
-static void gif_push_error();
+static void gif_push_error(void);
#if IM_GIFMAJOR >= 4
+static int gif_read_callback(GifFileType *gft, GifByteType *buf, int length);
+
/*
=item gif_scalar_info
return i_readgif_low(GifFile, colour_table, colours);
}
+/*
+
+Internal function called by i_readgif_multi_low() in error handling
+
+*/
+static void free_images(i_img **imgs, int count) {
+ int i;
+ for (i = 0; i < count; ++i)
+ i_img_destroy(imgs[i]);
+ myfree(imgs);
+}
+
+/*
+=item i_readgif_multi_low(GifFileType *gf, int *count)
+
+Reads one of more gif images from the given GIF file.
+
+Returns a pointer to an array of i_img *, and puts the count into
+*count.
+
+Unlike the normal i_readgif*() functions the images are paletted
+images rather than a combined RGB image.
+
+This functions sets tags on the images returned:
+
+=over
+
+=item gif_left
+
+the offset of the image from the left of the "screen" ("Image Left
+Position")
+
+=item gif_top
+
+the offset of the image from the top of the "screen" ("Image Top Position")
+
+=item gif_interlace
+
+non-zero if the image was interlaced ("Interlace Flag")
+
+=item gif_screen_width
+
+=item gif_screen_height
+
+the size of the logical screen ("Logical Screen Width",
+"Logical Screen Height")
+
+=item gif_local_map
+
+Non-zero if this image had a local color map.
+
+=item gif_background
+
+The index in the global colormap of the logical screen's background
+color. This is only set if the current image uses the global
+colormap.
+
+=item gif_trans_index
+
+The index of the color in the colormap used for transparency. If the
+image has a transparency then it is returned as a 4 channel image with
+the alpha set to zero in this palette entry. ("Transparent Color Index")
+
+=item gif_delay
+
+The delay until the next frame is displayed, in 1/100 of a second.
+("Delay Time").
+
+=item gif_user_input
+
+whether or not a user input is expected before continuing (view dependent)
+("User Input Flag").
+
+=item gif_disposal
+
+how the next frame is displayed ("Disposal Method")
+
+=item gif_loop
+
+the number of loops from the Netscape Loop extension. This may be zero.
+
+=item gif_comment
+
+the first block of the first gif comment before each image.
+
+=back
+
+Where applicable, the ("name") is the name of that field from the GIF89
+standard.
+
+=cut
+*/
+
+i_img **i_readgif_multi_low(GifFileType *GifFile, int *count) {
+ i_img *img;
+ int i, j, Size, Width, Height, ExtCode, Count, x;
+ int ImageNum = 0, BackGround = 0, ColorMapSize = 0;
+ ColorMapObject *ColorMap;
+
+ GifRecordType RecordType;
+ GifByteType *Extension;
+
+ GifRowType GifRow;
+ int got_gce = 0;
+ int trans_index; /* transparent index if we see a GCE */
+ int gif_delay; /* delay from a GCE */
+ int user_input; /* user input flag from a GCE */
+ int disposal; /* disposal method from a GCE */
+ int got_ns_loop = 0;
+ int ns_loop;
+ char *comment = NULL; /* a comment */
+ i_img **results = NULL;
+ int result_alloc = 0;
+ int channels;
+
+ *count = 0;
+
+ mm_log((1,"i_readgif_multi_low(GifFile %p, , count %p)\n", GifFile, count));
+
+ BackGround = GifFile->SBackGroundColor;
+
+ Size = GifFile->SWidth * sizeof(GifPixelType);
+
+ if ((GifRow = (GifRowType) mymalloc(Size)) == NULL)
+ m_fatal(0,"Failed to allocate memory required, aborted."); /* First row. */
+
+ /* Scan the content of the GIF file and load the image(s) in: */
+ do {
+ if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "Unable to get record type");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+
+ switch (RecordType) {
+ case IMAGE_DESC_RECORD_TYPE:
+ if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "Unable to get image descriptor");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+
+ if (( ColorMap = (GifFile->Image.ColorMap ? GifFile->Image.ColorMap : GifFile->SColorMap) )) {
+ mm_log((1, "Adding local colormap\n"));
+ ColorMapSize = ColorMap->ColorCount;
+ } else {
+ /* No colormap and we are about to read in the image -
+ abandon for now */
+ mm_log((1, "Going in with no colormap\n"));
+ i_push_error(0, "Image does not have a local or a global color map");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+
+ Width = GifFile->Image.Width;
+ Height = GifFile->Image.Height;
+ channels = 3;
+ if (got_gce && trans_index >= 0)
+ channels = 4;
+ img = i_img_pal_new(Width, Height, channels, 256);
+ /* populate the palette of the new image */
+ mm_log((1, "ColorMapSize %d\n", ColorMapSize));
+ for (i = 0; i < ColorMapSize; ++i) {
+ i_color col;
+ col.rgba.r = ColorMap->Colors[i].Red;
+ col.rgba.g = ColorMap->Colors[i].Green;
+ col.rgba.b = ColorMap->Colors[i].Blue;
+ if (channels == 4 && trans_index == i)
+ col.rgba.a = 0;
+ else
+ col.rgba.a = 255;
+
+ i_addcolors(img, &col, 1);
+ }
+ ++*count;
+ if (*count > result_alloc) {
+ if (result_alloc == 0) {
+ result_alloc = 5;
+ results = mymalloc(result_alloc * sizeof(i_img *));
+ }
+ else {
+ i_img **newresults;
+ result_alloc *= 2;
+ newresults = myrealloc(results, result_alloc * sizeof(i_img *));
+ }
+ }
+ results[*count-1] = img;
+ i_tags_addn(&img->tags, "gif_left", 0, GifFile->Image.Left);
+ /**(char *)0 = 1;*/
+ i_tags_addn(&img->tags, "gif_top", 0, GifFile->Image.Top);
+ i_tags_addn(&img->tags, "gif_interlace", 0, GifFile->Image.Interlace);
+ i_tags_addn(&img->tags, "gif_screen_width", 0, GifFile->SWidth);
+ i_tags_addn(&img->tags, "gif_screen_height", 0, GifFile->SHeight);
+ if (GifFile->SColorMap && !GifFile->Image.ColorMap) {
+ i_tags_addn(&img->tags, "gif_background", 0,
+ GifFile->SBackGroundColor);
+ }
+ if (GifFile->Image.ColorMap) {
+ i_tags_addn(&img->tags, "gif_localmap", 0, 1);
+ }
+ if (got_gce) {
+ if (trans_index >= 0)
+ i_tags_addn(&img->tags, "gif_trans_index", 0, trans_index);
+ i_tags_addn(&img->tags, "gif_delay", 0, gif_delay);
+ i_tags_addn(&img->tags, "gif_user_input", 0, user_input);
+ i_tags_addn(&img->tags, "gif_disposal", 0, disposal);
+ }
+ got_gce = 0;
+ if (got_ns_loop)
+ i_tags_addn(&img->tags, "gif_loop", 0, ns_loop);
+ if (comment) {
+ i_tags_add(&img->tags, "gif_comment", 0, comment, strlen(comment), 0);
+ myfree(comment);
+ comment = NULL;
+ }
+
+ ImageNum++;
+ mm_log((1,"i_readgif_multi_low: Image %d at (%d, %d) [%dx%d]: \n",
+ ImageNum, GifFile->Image.Left, GifFile->Image.Top, Width, Height));
+
+ if (GifFile->Image.Left + GifFile->Image.Width > GifFile->SWidth ||
+ GifFile->Image.Top + GifFile->Image.Height > GifFile->SHeight) {
+ i_push_errorf(0, "Image %d is not confined to screen dimension, aborted.\n",ImageNum);
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return(0);
+ }
+
+ if (GifFile->Image.Interlace) {
+ for (Count = i = 0; i < 4; i++) {
+ for (j = InterlacedOffset[i]; j < Height;
+ j += InterlacedJumps[i]) {
+ Count++;
+ if (DGifGetLine(GifFile, GifRow, Width) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "Reading GIF line");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+
+ i_ppal(img, 0, Width, j, GifRow);
+ }
+ }
+ }
+ else {
+ for (i = 0; i < Height; i++) {
+ if (DGifGetLine(GifFile, GifRow, Width) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "Reading GIF line");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+
+ i_ppal(img, 0, Width, i, GifRow);
+ }
+ }
+ break;
+ case EXTENSION_RECORD_TYPE:
+ /* Skip any extension blocks in file: */
+ if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "Reading extension record");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+ if (ExtCode == 0xF9) {
+ got_gce = 1;
+ if (Extension[1] & 1)
+ trans_index = Extension[4];
+ else
+ trans_index = -1;
+ gif_delay = Extension[2] + 256 * Extension[3];
+ user_input = (Extension[0] & 2) != 0;
+ disposal = (Extension[0] >> 2) & 3;
+ }
+ if (ExtCode == 0xFF && *Extension == 11) {
+ if (memcmp(Extension+1, "NETSCAPE2.0", 11) == 0) {
+ if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "reading loop extension");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+ if (Extension && *Extension == 3) {
+ got_ns_loop = 1;
+ ns_loop = Extension[2] + 256 * Extension[3];
+ }
+ }
+ }
+ else if (ExtCode == 0xFE) {
+ /* while it's possible for a GIF file to contain more than one
+ comment, I'm only implementing a single comment per image,
+ with the comment saved into the following image.
+ If someone wants more than that they can implement it.
+ I also don't handle comments that take more than one block.
+ */
+ if (!comment) {
+ comment = mymalloc(*Extension+1);
+ memcpy(comment, Extension+1, *Extension);
+ comment[*Extension] = '\0';
+ }
+ }
+ while (Extension != NULL) {
+ if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "reading next block of extension");
+ free_images(results, *count);
+ DGifCloseFile(GifFile);
+ return NULL;
+ }
+ }
+ break;
+ case TERMINATE_RECORD_TYPE:
+ break;
+ default: /* Should be trapped by DGifGetRecordType. */
+ break;
+ }
+ } while (RecordType != TERMINATE_RECORD_TYPE);
+
+ if (comment) {
+ if (*count) {
+ i_tags_add(&(results[*count-1]->tags), "gif_comment", 0, comment,
+ strlen(comment), 0);
+ }
+ myfree(comment);
+ }
+
+ myfree(GifRow);
+
+ if (DGifCloseFile(GifFile) == GIF_ERROR) {
+ gif_push_error();
+ i_push_error(0, "Closing GIF file object");
+ free_images(results, *count);
+ return NULL;
+ }
+
+ return results;
+}
+
+/*
+=item i_readgif_multi(int fd, int *count)
+
+=cut
+*/
+i_img **
+i_readgif_multi(int fd, int *count) {
+ GifFileType *GifFile;
+
+ i_clear_error();
+
+ mm_log((1,"i_readgif_multi(fd %d, &count %p)\n", fd, count));
+
+ if ((GifFile = DGifOpenFileHandle(fd)) == NULL) {
+ gif_push_error();
+ i_push_error(0, "Cannot create giflib file object");
+ mm_log((1,"i_readgif: Unable to open file\n"));
+ return NULL;
+ }
+
+ return i_readgif_multi_low(GifFile, count);
+}
+
+/*
+=item i_readgif_multi_scalar(char *data, int length, int *count)
+
+=cut
+*/
+i_img **
+i_readgif_multi_scalar(char *data, int length, int *count) {
+#if IM_GIFMAJOR >= 4
+ GifFileType *GifFile;
+ struct gif_scalar_info gsi;
+
+ i_clear_error();
+
+ gsi.cpos=0;
+ gsi.length=length;
+ gsi.data=data;
+
+ mm_log((1,"i_readgif_multi_scalar(data %p, length %d, &count %p)\n",
+ data, length, count));
+
+ if ((GifFile = DGifOpen( (void*) &gsi, my_gif_inputfunc )) == NULL) {
+ gif_push_error();
+ i_push_error(0, "Cannot create giflib callback object");
+ mm_log((1,"i_readgif_multi_scalar: Unable to open scalar datasource.\n"));
+ return NULL;
+ }
+
+ return i_readgif_multi_low(GifFile, count);
+#else
+ return NULL;
+#endif
+}
+
+/*
+=item i_readgif_callback(i_read_callback_t cb, char *userdata, int **colour_table, int *colours)
+
+Read a GIF file into an Imager RGB file, the data of the GIF file is
+retreived by callin the user supplied callback function.
+
+This function is only used with giflib 4 and higher.
+
+=cut
+*/
+
+i_img**
+i_readgif_multi_callback(i_read_callback_t cb, char *userdata, int *count) {
+#if IM_GIFMAJOR >= 4
+ GifFileType *GifFile;
+ i_img **result;
+
+ i_gen_read_data *gci = i_gen_read_data_new(cb, userdata);
+
+ i_clear_error();
+
+ mm_log((1,"i_readgif_multi_callback(callback %p, userdata %p, count %p)\n", cb, userdata, count));
+ if ((GifFile = DGifOpen( (void*) gci, gif_read_callback )) == NULL) {
+ gif_push_error();
+ i_push_error(0, "Cannot create giflib callback object");
+ mm_log((1,"i_readgif_callback: Unable to open callback datasource.\n"));
+ myfree(gci);
+ return NULL;
+ }
+
+ result = i_readgif_multi_low(GifFile, count);
+ free_gen_read_data(gci);
+
+ return result;
+#else
+ return NULL;
+#endif
+}
+
/*
=item i_writegif(i_img *im, int fd, int max_colors, int pixdev, int fixedlen, i_color fixed[])
static int
gif_read_callback(GifFileType *gft, GifByteType *buf, int length) {
- return i_gen_reader((i_gen_read_data *)gft->UserData, buf, length);
+ return i_gen_reader((i_gen_read_data *)gft->UserData, (char*)buf, length);
}
#endif
*/
}
+static int
+in_palette(i_color *c, i_quantize *quant, int size) {
+ int i;
+
+ for (i = 0; i < size; ++i) {
+ if (c->channel[0] == quant->mc_colors[i].channel[0]
+ && c->channel[1] == quant->mc_colors[i].channel[1]
+ && c->channel[2] == quant->mc_colors[i].channel[2]) {
+ return i;
+ }
+ }
+
+ return -1;
+}
+
+/*
+=item has_common_palette(imgs, count, quant, want_trans)
+
+Tests if all the given images are paletted and have a common palette,
+if they do it builds that palette.
+
+A possible improvement might be to eliminate unused colors in the
+images palettes.
+
+=cut */
+static int
+has_common_palette(i_img **imgs, int count, i_quantize *quant, int want_trans,
+ i_gif_opts *opts) {
+ int size = quant->mc_count;
+ int i, j;
+ int imgn;
+ int x, y;
+ char used[256];
+
+ /* we try to build a common palette here, if we can manage that, then
+ that's the palette we use */
+ for (imgn = 0; imgn < count; ++imgn) {
+ if (imgs[imgn]->type != i_palette_type)
+ return 0;
+
+ if (opts->eliminate_unused) {
+ i_palidx *line = mymalloc(sizeof(i_palidx) * imgs[imgn]->xsize);
+ int x, y;
+ memset(used, 0, sizeof(used));
+
+ for (y = 0; y < imgs[imgn]->ysize; ++y) {
+ i_gpal(imgs[imgn], 0, imgs[imgn]->xsize, y, line);
+ for (x = 0; x < imgs[imgn]->xsize; ++x)
+ used[line[x]] = 1;
+ }
+
+ myfree(line);
+ }
+ else {
+ /* assume all are in use */
+ memset(used, 1, sizeof(used));
+ }
+
+ for (i = 0; i < i_colorcount(imgs[imgn]); ++i) {
+ i_color c;
+
+ i_getcolors(imgs[imgn], i, &c, 1);
+ if (used[i]) {
+ if (in_palette(&c, quant, size) < 0) {
+ if (size < quant->mc_size) {
+ quant->mc_colors[size++] = c;
+ }
+ else {
+ /* oops, too many colors */
+ return 0;
+ }
+ }
+ }
+ }
+ }
+
+ quant->mc_count = size;
+
+ return 1;
+}
+
+static i_palidx *
+quant_paletted(i_quantize *quant, i_img *img) {
+ i_palidx *data = mymalloc(sizeof(i_palidx) * img->xsize * img->ysize);
+ i_palidx *p = data;
+ i_palidx trans[256];
+ int i;
+ int x, y;
+
+ /* build a translation table */
+ for (i = 0; i < i_colorcount(img); ++i) {
+ i_color c;
+ i_getcolors(img, i, &c, 1);
+ trans[i] = in_palette(&c, quant, quant->mc_count);
+ }
+
+ for (y = 0; y < img->ysize; ++y) {
+ i_gpal(img, 0, img->xsize, y, data+img->xsize * y);
+ for (x = 0; x < img->xsize; ++x) {
+ *p = trans[*p];
+ ++p;
+ }
+ }
+
+ return data;
+}
+
/*
=item i_writegif_low(i_quantize *quant, GifFileType *gf, i_img **imgs, int count, i_gif_opts *opts)
int scrw = 0, scrh = 0;
int imgn, orig_count, orig_size;
int posx, posy;
+ int trans_index;
mm_log((1, "i_writegif_low(quant %p, gf %p, imgs %p, count %d, opts %p)\n",
quant, gf, imgs, count, opts));
/* we always generate a global palette - this lets systems with a
broken giflib work */
- quant_makemap(quant, imgs, 1);
- result = quant_translate(quant, imgs[0]);
+ if (has_common_palette(imgs, 1, quant, want_trans, opts)) {
+ result = quant_paletted(quant, imgs[0]);
+ }
+ else {
+ quant_makemap(quant, imgs, 1);
+ result = quant_translate(quant, imgs[0]);
+ }
+ if (want_trans) {
+ trans_index = quant->mc_count;
+ quant_transparent(quant, result, imgs[0], trans_index);
+ }
- if (want_trans)
- quant_transparent(quant, result, imgs[0], quant->mc_count);
-
if ((map = make_gif_map(quant, opts, want_trans)) == NULL) {
myfree(result);
EGifCloseFile(gf);
if (!do_ns_loop(gf, opts))
return 0;
- if (!do_gce(gf, 0, opts, want_trans, quant->mc_count)) {
+ if (!do_gce(gf, 0, opts, want_trans, trans_index)) {
myfree(result);
EGifCloseFile(gf);
return 0;
if (want_trans && quant->mc_size == 256)
--quant->mc_size;
- quant_makemap(quant, imgs+imgn, 1);
- result = quant_translate(quant, imgs[imgn]);
- if (want_trans)
- quant_transparent(quant, result, imgs[imgn], quant->mc_count);
-
+ if (has_common_palette(imgs+imgn, 1, quant, want_trans, opts)) {
+ result = quant_paletted(quant, imgs[imgn]);
+ }
+ else {
+ quant_makemap(quant, imgs+imgn, 1);
+ result = quant_translate(quant, imgs[imgn]);
+ }
+ if (want_trans) {
+ quant_transparent(quant, result, imgs[imgn], quant->mc_count);
+ trans_index = quant->mc_count;
+ }
+
if (!do_gce(gf, imgn, opts, want_trans, quant->mc_count)) {
myfree(result);
EGifCloseFile(gf);
}
else {
int want_trans;
+ int do_quant_paletted = 0;
/* get a palette entry for the transparency iff we have an image
with an alpha channel */
the colormap. */
/* produce a colour map */
- quant_makemap(quant, imgs, count);
- result = quant_translate(quant, imgs[0]);
+ if (has_common_palette(imgs, count, quant, want_trans, opts)) {
+ result = quant_paletted(quant, imgs[0]);
+ ++do_quant_paletted;
+ }
+ else {
+ quant_makemap(quant, imgs, count);
+ result = quant_translate(quant, imgs[0]);
+ }
if ((map = make_gif_map(quant, opts, want_trans)) == NULL) {
myfree(result);
for (imgn = 1; imgn < count; ++imgn) {
int local_trans;
- result = quant_translate(quant, imgs[imgn]);
+ if (do_quant_paletted)
+ result = quant_paletted(quant, imgs[imgn]);
+ else
+ result = quant_translate(quant, imgs[imgn]);
local_trans = want_trans && imgs[imgn]->channels == 4;
if (local_trans)
quant_transparent(quant, result, imgs[imgn], quant->mc_count);
{
i_gen_write_data *gwd = (i_gen_write_data *)gf->UserData;
- return i_gen_writer(gwd, data, size) ? size : 0;
+ return i_gen_writer(gwd, (char*)data, size) ? size : 0;
}
#endif
=cut
*/
-static void gif_push_error() {
+static void gif_push_error(void) {
int code = GifLastError(); /* clears saved error */
i_push_error(code, gif_error_msg(code));
projects / imager.git / blobdiff